Amazing Science Fiction Stories, Volume 21 Number 4, April of 1947. Published by Ziff-Davis Publishing Company, One Park Avenue, New York 16, New York. Dimensions are 5 1/2" width by 7 1/2" Height and 201grams, 178 pages. Copyright was issued in 1947, but no renewal was recorded, this work is Public Domain under Rule 6 of the Copyright Statutes of the United States. Etext created by Gerard Arthus.